Because coffee exists in the form of cups in most cases, and beer, in most cases, is either bottled or canned, you can drink it directly. "Starbucks coffee" can only be written as starbucks coffee, not starbucks café. Cafe/café in English is only related to the meaning of "coffee house", but more often refers to small restaurants, some of which serve alcoholic beverages, and even... Now we can reply directly, why can we just say a coffee, a beer.
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Later I also checked on Wikipedia: coffeehouse coffeehouse and coffee shop are related terms for an establishment which primarily serves hot coffee, related coffee beverages (e.g., espresso,.